tryjs_form_validate_number 在线代码实例

实例代码( Tip: 登录后体验更佳 )

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
  <form name="myForm" action="demo_form.asp" onsubmit="return validateForm();" method="post"> 
    <strong>请输入1到10之间的数字：</strong>
    <input id="number">
    <button type="button" onclick="myFunction()">提交</button>
  </form>
  <script type="text/javascript">
    function myFunction() {
      var x = document.getElementById("number").value;//获取id="number"的值
      //如果输入的值 x 不是数字或者小于 1 或者大于 10，则提示错误
      if (isNaN(x) || x < 1 || x > 10) {
        alert("您输入有误，请输入1到10之间的数字！！！");
        return false;
      } else {
        alert("您输入正确");
        return true;
      }
    }
  </script>
</body>
</html>
 
 
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运行结果
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